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Journal of Desert Research ›› 2026, Vol. 46 ›› Issue (2): 251-262.DOI: 10.7522/j.issn.1000-694X.2025.00166

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The Ulan Buh Desert photovoltaic power station alters soil particle size distribution and rainfall redistribution process

Junyu Zhou1(), Peijing Chang2, Haiying Wang2, Zhiming Xin3, Zixuan Yuan1, Wentao Zhu1, Yujie Yan1, Yiben Cheng1()   

  1. 1.College of Soil and Water Conservation,Beijing Forestry University,Beijing 100083,China
    2.Alxa League Climate Ecological Environment Assessment Center,Alxa Left Banner 750300,Inner Mongolia,China
    3.Desert Forestry Experimental Center,Chinese Academy of Forestry,Dengkou 015200,Inner Mongolia,China
  • Received:2025-10-09 Revised:2025-12-01 Online:2026-03-20 Published:2026-04-13
  • Contact: Yiben Cheng

Abstract:

To evaluate the impacts of photovoltaic power stations in desert areas on changes in soil particle size and soil water content, in four PV power stations with different operational durations in the Ulan Buh Desert, a total of 320 soil particle size sampling points were arranged based on the categories of inter-panel/beneath-panel and surface layer (0-20 cm)/deep layer (20-40 cm). Meanwhile, soil moisture monitor probes were deployed at 5 geometric positions (A-E) and 2 depths (30/60 cm) in a typical station. Combined with the observation of runoff confluence in front of the panels, the soil moisture dynamics were monitored from April to November 2024. The results showed that: (1) At the site scale, the soil particle size presented a pattern of finer particles in the center and coarser particles at the edges. Fine particle size centers appeared in the inter-panel areas of the upwind direction, while coarse particle size centers occurred near the bottom gap of the panels in the areas beneath the panels. (2) Compared with the control before the power stations were built, the mean particle size in both inter-panel and beneath panels areas generally decreased (soil particle size refinement), and the volume fraction of fine sand (100-250 μm) increased, and the degree of particle size dispersion in the surface layer of inter-panel areas decreases with the increase of operational duration. (3) The panel geometry caused rainfall to accumulate at the front eaves and resulted in water deficiency in the middle of the panels. The soil water content at 160 cm in front of the PV panels and directly below the front eaves in the surface layer reached 3.16%-3.22%, which was higher than that in the middle of the panels in the surface layer (about 1.13%). (4) The surface soil was sensitive to rainfall pulses, while the deep layer was dominated by slow infiltration. The study suggests that the impacts of PV power stations for photovoltaic sand control on soil particle size exhibit a duration-dependent effect, while their impacts on soil water show a position-dependent characteristic. It is recommended to add protective belts at the edges of the station sites and optimize the panel geometry and flow diversion facilities, so as to reduce the degree of soil particle size erosion caused by external factors, alleviate water deficiency in the middle of the panels, and improve infiltration in front of the panels.

Key words: Ulan Buh Desert, photovoltaic sand control, soil particle size, soil water content, rainfall redistribution

CLC Number: